While mining 39 Th/s of Bitcoin, it also simultaneously heats and cleans the air of 36 square metres of space. It also allows both solo and pool mining.
Discussion
So, all miners produce heat, generally the goal is energy efficiency of the output heat in terms of Joules per terahash (J/TH) .
I don't have dirty air, but if I did, I'm pretty certain that you can either have a fresh, dirty supply that contains oxygen or recycled, clean air with depleted oxygen which will suffocate you.